Icing - Coating of ice on an object, e.g., the mast or superstructure of a vessel
IMO Class - Group of dangerous or hazardous goods, harmful substances, or marine pollutants in sea transport as classified in the International Maritime Dangerous Goods Code (IMDG Code)
Inert (to) - To reduce the oxygen in a tank with inert gas to avoid an explosive atmosphere.
Initial course - Course directed by the OSC or other authorized person to be steered at the beginning of a search
Inoperative - Not Functioning
Jettison (to) (of cargo) - To throw goods overboard to lighten the vessel or improve its stability in an emergency.
Launch (to) - To lower, e.g., lifeboats, to the water
Leaking - Escape of liquids such as water, oil, etc., out of pipes, boilers, tanks, etc., or a minor inflow of seawater into the vessel due to damage to the hull
Leeward - On or towards the sheltered side of a ship; opposite of windward
Leeway - Vessel’s sideways drifted leeward of the desired course
Let go (to) - To set free, let loose, or cast off (of anchors, lines, etc.)
Lifeboat station - Place assigned to crew and passengers to muster before being ordered into the lifeboats
List Here - the inclination of the vessel to the port side or starboard side
Located - In navigational warnings: Position of object confirmed
Make water (to) - To have seawater flowing into the vessel due to hull damage or hatches awash and not properly closed
Moor (to) - To secure a vessel in a particular place using wires or ropes made fast to the shore, to anchors, or anchored mooring buoys, or to ride with both anchors down
MRCC - Maritime Rescue Co-ordination Centre: land-based authority responsible for promoting efficient organization of maritime search and rescue and for co-ordinating the conduct of search and rescue operations within a search and rescue region
Muster (to) - To assemble crew, passengers, or both in a special place for purposes of checking
Muster list - List of crew, passengers and others on board and their functions in a distress or drill
Not under command (abbr. NUC) - a vessel which through exceptional circumstances is unable to manoeuvre as required by the COLREGs
Obstruction - An object such as a wreck, net, etc., which blocks a fairway, route, etc.
Off air - When the transmissions of a radio station, etc., have broken down, been switched off, or suspended
Off station (of buoys) - Not in the charted position
Oil clearance - Oil skimming from the surface of the water
Operational - Ready for immediate use
Ordnance exercise - Naval firing practice
OSC - On-Scene Co-ordinator: A person designed to co-ordinate search and rescue operations within a specified area
Overflow - Escape of oil or liquid from a tank because of a twofold condition as a result of overflowing, thermal expansion, change in vessel trim or vessel movement
Polluter - A vessel emitting harmful substances into the air or spilling oil into the sea
Preventers - Ropes or wires attached to derricks to prevent them from swinging during cargo handling operations
Proceed (to) - To sail or head for a certain position or to continue with the voyage
PA-system - Public address system: loudspeakers in the vessel's cabins, mess rooms, etc., and on deck through which important information can be broadcast from a central point, mainly from the navigation bridge
Recover (to) Here - to pick up shipwrecked persons
Refloat (to) - To pull a vessel off after grounding; to set it afloat again
Rendez-vous - An appointment between vessels normally made on the radio to meet in a certain area or position
Reported - In navigational warnings: position of object unconfirmed
Restricted area - A deck, space, area, etc., in vessels where, for safety reasons, entry is only permitted for authorized crew members
Resume (to) Here - to re-start a voyage, service, or search
Retreat signal Sound - visual or another signal to a team ordering it to return to its base
Rig move - The movement of an oil rig, drilling platform, etc., from one position to another
Roll call - The act of checking how many passengers and crew members are present, e.g., at assembly stations, by reading aloud a list of their names